DSS is a complication of DHF... when you lose excessive blood
due to hemorrhage, you will lose your plasma volume (or the water
content to be frank in the body). The blood pressure and pulse rate
will try to compensate immediately by vasoconstriction
(constriction of blood vessel) and increment of pulse rate
(tachycardia) to maintain perfusion of blood to vital organs such
as the brain, heart, lungs, kidneys and adrenals to name a
few.
Once the blood escapes from its blood vessels to its extravascular
(outside the blood vessels) space, the patient will be subjected to
hypovolemic (low in volume) shock, which may render the patient to
coma and then followed by death shortly...